Repeater compass



March 9, 1948. L. P. CROSMAN 2,437,506

REPEATER COMPASS Filed Jun 16'. 1943 s Sheets$heet 1 M 1 INVENTOR lo ing PC1 03 an 151 200 @5-200 W 6 VAC @ev/yc @mzaal BY @+90 06 @wzoav J March 9, 1948. P; CROSMAN REPEATER COMPASS Filed June 16, 1943 5 Sheets-Sheet 4 INVENTOR lotentecl Mar. 9, 1948 UNITED STATES PATENT OFFICE asslgnoi' to Monroe pony, Orange,

Calculating Machine Com N. J, o corporation of Delaware Applleatlon .lwee 16, 19452, Sen-ml No. 491,269

till. 33 -222'l E5 Elotms. i

The invention has relation to repeater oomeesses whereby the reading of a magnetic compass may 'be duplicated at 9, remote station end/or said magnetic compass may eontrol other mechanism,

invention consists in the novel construe ties: and combination of parts as set forth in the amended claims.

Zn the accompanying tlrewlngs illustrating the invention,

l ig, is a dieg'remmet-ic piers View of rose netie compose ore /"ideal with follower mechanism.

2 is a plan View of a repeater compass, oonstruotecl in. accordance with the invention.

lg. similar View with parts removed.

' side elevation of the repeater oom- 2 and 3 with. parts broken into lse ise Figs.

s on etiles'eecl central transverse vertical View through the repeater dial and es soeioted parts.

' e glen View of the plotting meol'i ViEW of Joe integtett sin parts omitted, losing with 'vfolefs the re w application ls sliotm as act is: U. S. Potent 55,325,- E, Britten, on July 27, mechanism the compass is sz itrell-ed; by photo-electric devices eom sou'roe of l t 33 (Fig. l) mounterl "leisure saving a, vertical slot T om source 12 passing 1g 2, ll'll'flO; t l fixed upon tl ee es the compass needle e together with the photo-electric tubes iescllbecl, are carried on e rotary plate totes within the compass casing, and upon driven movement of the plate, as modituming movement 0'? the conveyance Wm l 1,515 oompass is mount-eel, the parts carried. pen the plate will move relatively to the oompass needle and. mirror t l, so that the light reflected. from this mirror will strike one of two ors 2Q angulerly clls ooseil upon the Wall ie closure one at either side of slot will lee reflected therefrom to one on" the other of two photoelectrie tubes 25.

i one then in the Tubes 25 mid. 28 have electrical oon'oeetloii each with one of a goals: of thyretron tubes ill, these tubes being elasecl through a rheostet 2% as shown diagrammatically in Fig. l. The grid of eithez" one 01' these thts tetron tubes, "belng slightly raised potential by the photoelectric emission of tube or 26, in response to the light beam, serves to establish e circuit oi oompax'etlvely lz'lgl'z. voltage through the thymtron and tl' coueli 9, related relay or 82, which in eont ols one rotating plate 518 in one or l direction,

As shown, the relays serve to to reversing" switch 35 interposed in the suit on electric motes which motor has sif ng eonfoeotlon, hereinettes described, Wit '5: also 5355 (FF-lg. which meshes with gear toot tomsetl in the oetiphery of plate The ollower "1= eolsm will keep the plate tote-ting first lo other direction, eontroleil known manner, so ill be settled around e :ooowlog relative movement;

by the tubes 25,

e source of lig....t bowl in 2 1|, oil-Figs. 3 ill orb/"e11: om throng. e

motor L2, worm if;

s meshes with the wow sets '33, E33 76 soon pivoted upon a ouslii in su'oportin frame of the tepeet wheel of e upon an arm U1 (Fig. inserted in train with pinion to which the hand 3 pass is fixed, saicl sheiit passing through the bushing til. i i i is *orovided. with a:

pivotal movemei i eel 33y sent s "Ling brake beers A lateral 10 provide Emotion,

Shaft l has driving connection through gee-1* lug with. a, shalt 32, connected with the goiiitoo of the compass follower mechanism stated regulates thereversa-l 013 the drive from motor (The driving connection Toe tween ports and 35 will be more oartlouletly described. under the heading of The reorlentlug means). Therefore, when the circuit through the motor is established, shaft lll will be else on oscillating motion and also an over all totem motion in following the compass needle in movements relative to the conveyance, Elie gearing l3, l5 and one lt have in the normal adjustment of stop I a differential movement whereby the oscillatory hunting action is not transmitted to hand 18, but merely the over all rotational movement. This is effected because of therelative absence of friction encountered in the pivotal movement of arm I4 as compared with the friction encountered in the gear train 18, I6 and the spring brake 80. Therefore, upon rotation of shaft and worm 12, arm 14 will be oscillated to the limitof the movement allowed by stop 19 and hand 18 will be rotated only when the oscillation of arm ll in one direction or the other is excessive, whereupon pinion I8 will be rotated and movement transmitted to shaft I1.

Stop 79 is formed as a cone, provided with a flat base I9'-engaging a frame plate 18" to prevent rotation of the stop. For purposes of adjustment this stop I9 is longitudinally bored and screw threaded and is engaged, as a nut, with a screw 83, mounted in bearings 84, 84 of the frame and held frictionally against rotation by spring 88. Screw 83 is provided with a knurled head 83' by means of which stop nut 19 may be adjusted relative to the jaws of extension 14'. In normal adjustment of stop nut 18, the lost oscillatory motion of arm 14 is sufficient to counteract or substantially counteract the hunting movement of the compass controlled follower mechanism, so that hand 18 will not oscillate. However, the base of the cone shaped stop nut 19 is broad enough to form a rigid lock against movement for arm 74, when stop 19 is adjusted to eng ge the stationary frame plate, thus establishing a direct drive of the hand 18 from shaft II! which will be useful as hereinafter described.

The integrator The repeater compass may be used in connection with other mechanism, such as an odograph; means for charting deviations from a ships course; automatic steering mechanism, etc. Such mechanism includes, an integrator, to be now described, being means whereby the different directional components (such as north or south andeast or west), of the progressive movement of a vehicle may be integrated to eifect movement of a stylus to record upon a chart the direction and extent of such movement, that is to say to record the path of the vehicle.

In the present application an odograph is shown, whereby a map or chart is plotted to represent the course of a conveyance. The chart table 86' is shown in Fig, 6, wherein a holder 88 for a pen, pencil or stylus 87 is mounted on cross rods 88, 88, in known manner, movement of holder 88 and stylus 8'! being determined by the travel of nuts 88' upon right angularly related threaded rods 8i, said threaded rods being rotated by gears 92 from said integrating means as will be explained. The cross rods 88 have at the ends thereof pinions 89 traveling upon racks 90.

The progressive movement of the conveyance is measured through the driving motion of a propeller shaft, automatic log, speedometer or other appropriate source, from which motion is transmitted through a shaft 93 (Fig. 7).

Rotation of shaft 93 is transmitted through gearing 94 to toothed cylinders 95, 96, these cylinders being driven in opposite directions at a speed proportional to the speed or rate of ad- Vance of the conveyance.

The pinions 91 are mounted upon splined shafts 98 located upon opposite sides of and having their longitudinal axes parallel to the cylinders 95, 96,

4 these pinions meshing with the teeth 81' ofthe cylinderaand being moved longitudinally thereof by means 01'' fingers 99 of bars 99' located upon opposite sides of said shafts 98, said bars being mounted upon reciprocatory plates I 00, the latter being carried by links I0l, pivoted at one end thereto at I0! and at the other end pivoted upon shafts I III". The plates I00 and consequently the pinions 91 are reciprocated by means of two rollers I02 of crank arms I02 located upon opposite ends of a shaft I03 having bearings i the stationary framing, said crank arms being located at right angles to each other and said shaft I (I3 being driven by gears I04 from said shaft I0,

Shafts 98, 98 are provided with worms I05, I05, meshing with worm wheels I06, I06 fast respectively upon a shaft I01 and a sleeve I08, this shaft and sleeve having respective gearing connection (not shown) with the gears 92 associated with the chart table 88'.

The reorienting means It will be obvious from the aforesaid and what will follow that the repeater dial- I I5 (to be described), the repeater hand I8 (when the lost motion of arm M is eliminated) and the integrating means of the odograph, will all by the use of this invention become reoriented or reset relative to the magnetic compass, in unison.

Between the shaft 82 and the pinion 35 is interposed movement transmission means which in the present case is a planetary differential gearing of conventional type, located at point I 09 (Fig, 3), but not shown in detail. The first leg of this differential is fast to shaft 82 and receives motion therefrom; the second leg is fast to a shaft I I8, having direct driving connection (not shown) with the pinion 35, and the third leg is fast with a gear II I, with which meshes spur gear I I2, the shaft of which has bevel gear connection I I2 with a shaft I II, the latter having spur gear connection Ill" with a shaft carrying a pinion II 3 (Fig. 4) meshing with a gear I I4 (Figs. 4 and 5) having frictional driving connection lid with the gear I22 (to be described), the latter being fast to dial I I5 of the repeater compass.-

This third leg of the difierential is normally locked against movement by means of a manipulabel device or .iamb nut I I 6 (Fig. 4) engaging the upper threaded portion of said shaft III, which is capable of slight slidable reciprocatory movement in bearings of the stationary frame. Turning of nut IIB down. against a sleeve I I8 will pull shaft Ill upwardly, bringing a collar I I8 of said shaft into frictional contact with a plate of the stationary frame. Under these conditions,

the drive will go directly from shaft 82 to shaft Upon loosening of nut I I6, however, the frictional load upon the second leg II 0 of the differential will be greater than the load upon the third leg I l I, so that the movement transmission gearing will be rendered ineffective with respect to the compass controlled follower mechanism and will be rendered efiective with respect to the dial H5; and will also be rendered effective with respect to the hand 18, provided stop nut 19 is adjusted to eliminate lost motion of arm I4. The gear ratios are so designed that movement of dial I I5 through the driving connections I I2, etc., to H4 as aforesaid and the movement of hand 18 through gearing 13, 76 (with stop nut I8 adjusted to eliminate the lost motion of arm 14) will be at the same speed and in the same direction.

said stop being normally positioned to permit ment having a forked end embracing @216 stop.

U STATES PATENTS limited losi', oscillatory motion of said elemena Number Blame Date prior to engaging said stop and being adjustable ,585,210 Roux May 18, 1926 to engage'the said element and render the same 5 1,617,310 Sperry Feb. 8, 1927 incapable of such lost motion. 1,785,241 Bates Dec, 16, 1930 1,911,168 Sperry et a1 May 23, 1933 LORDIG P. CROS. 5 ,144 Wittkuhns May 15, 1934 v v 2,325,365 Britten July 27, 1943 N 2|" REFERENCES GIT 1 FOREGN P V The following references are of record in the Number Country Date Great Britain -e 1925 file of this patent: 

